My wifes 2011 Buick enclave cxl was making a horrible death wobble from the rear when making sharp turns especially in close parking - I changed the differential assembly reusing the original clutch ASSY, torque tube and differential module. The noises went away but now I get the service all wheel drive message. I changed the battery because it was old and I have put the car on a lift and all four wheels turn like normal...I would not care too much cause you push the check button on the dash and the message goes away-problem is the car will not pass inspection because it will not communicate with the inspection machine. WHY THE LIGHT? help please...